Not viable because both hunter and warlock damage lack the damage to kill after all the nerfs.
Aside from KFC, hunters have no place in arena anymore and warlock ain't to great either..

Destro + BM is even a very bad choice because you have literally 0 damage outside of cooldowns and destro is just very easy to shutdown during cooldowns so don't expect big damage from that either.
The opposite team either has to make a massive mistake or must be playing an even worse comp in order to win because outside of cooldowns, there is literally 0 pressure going on from your side.